Grindwell Norton Ltd. Offers Offhand Wheels - Portable with Hard Black Silicon Carbide. Grindwell Norton Ltd. Manufactures Abrasives [Bonded, Coated, Non-Woven, Super abrasives and Thin Wheels] and Silicon Carbide, High Performance Refractory and Performance Plastics products. The Offhand Wheels - Portable with Hard Black Silicon Carbide is available in Tough, Brown and Aluminium Oxide. The Offhand Wheels - Portable with Hard Black Silicon Carbide is used for smoothening of weld seams and to give better finish.